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Transparent polyamide and preparation method thereof

A polyamide and polyamide salt technology, applied in the field of transparent polyamide and its preparation, can solve the problems of material toughness, touch, and size that are difficult to meet the requirements, achieve improvement and visibility, facilitate quantitative production, and process parameters are easy to control Effect

Active Publication Date: 2020-06-19
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the structure of polyamide, even-numbered dibasic acids and diamines can ensure the formation of more hydrogen bonds, that is, the formation of a larger intermolecular hydrogen bond density, but the resulting material toughness, touch, size, etc. It is difficult to meet the requirements in some specific fields of use

Method used

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  • Transparent polyamide and preparation method thereof
  • Transparent polyamide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Under nitrogen, mix 1,5-pentanediamine (DN5), MACM, undecanedibasic acid (DC11) and water evenly, and the molar ratio is DN5:MACM:DC11=20:80 : 100, the salt solution of 60% polyamide is obtained, wherein the salt weighs 20kg; then add 1,5-pentanediamine to adjust the pH value of the salt solution, so that the pH value when it is diluted to 10wt.% is 7.80, add Stabilizer potassium hypophosphite, the addition amount is 0.015 mole fraction;

[0049](2) Heat the salt solution of polyamide, the pressure in the reaction system rises to 1.6Mpa, takes 1 hour and 20 minutes, exhausts, maintains the pressure, and maintains the pressure for 4 hours, and the temperature of the reaction system is 240 ° C when the pressure is completed. Reduce the pressure again to reduce the pressure in the reaction system to 0.01MPa (gauge pressure), and the depressurization time is 50min. After the depressurization ends, the temperature of the reaction system is 263°C;

[0050] (3) The crysta...

Embodiment 2

[0053] (1) Under nitrogen, mix 1,5-pentanediamine (DN5), MACM, undecanedibasic acid (DC11) and water evenly, and the molar ratio is DN5:MACM:DC11=40:60 : 100, the salt solution of 60% polyamide is obtained, wherein the salt weighs 20kg; then add 1,5-pentanediamine to adjust the pH value of the salt solution, so that the pH value when it is diluted to 10wt.% is 7.80, add Stabilizer potassium hypophosphite, the addition amount is 0.015 mole fraction;

[0054] (2) Heat the salt solution of polyamide, the pressure in the reaction system rises to 1.6Mpa, takes 1 hour and 20 minutes, exhausts, maintains the pressure, and maintains the pressure for 4 hours, and the temperature of the reaction system is 240 ° C when the pressure is completed. Reduce the pressure again to reduce the pressure in the reaction system to 0.01MPa (gauge pressure), and the depressurization time is 50min. After the depressurization ends, the temperature of the reaction system is 263°C;

[0055] (3) The cryst...

Embodiment 3

[0058] (1) Under nitrogen, mix 1,5-pentanediamine (DN5), MACM, undecanedibasic acid (DC11) and water evenly, and the molar ratio is DN5:MACM:DC11=50:50 : 100, to prepare a 60% polyamide salt solution, wherein the salt weighs 20kg; then add 1,5-pentanediamine to adjust the pH value of the salt solution so that the pH value when it is diluted to 10wt.% is 7.85, Add stabilizer potassium hypophosphite in an amount of 0.015 mole fractions;

[0059] (2) Heat the salt solution of polyamide, the pressure in the reaction system rises to 1.6Mpa, takes 1 hour and 20 minutes, exhausts, maintains the pressure, and maintains the pressure for 4 hours, and the temperature of the reaction system is 240 ° C when the pressure is completed. Reduce the pressure again to reduce the pressure in the reaction system to 0.01MPa (gauge pressure), and the depressurization time is 50min. After the depressurization ends, the temperature of the reaction system is 263°C;

[0060] (3) The crystallization acc...

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Abstract

The invention discloses transparent polyamide, which comprises the following monomer raw materials in parts by weight: 100 parts of long-chain dicarboxylic acid or mixed long-chain dicarboxylic acid,20-70 parts of pentamethylene diamine and 80-30 parts of alicyclic diamine, wherein the molecular formula of the long-chain dicarboxylic acid is HOOC-R1-COOH, R1 comprises (CH2)n, n is 7, 9, 11, 13 or15, and the alicyclic diamine comprises one or more of 3,3-dimethyl-4,4-diaminodicyclohexylmethane (MACM), 4,4'-diaminodicyclohexylmethane (PACM) and 2,2-bis(4-aminocyclohexane)propane (PACP). The transparent polyamide disclosed by the invention has proper hydrogen bond density and low crystallization degree, so that good toughness and good transparency are achieved.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a transparent polyamide containing an odd-numbered carbon long-chain dibasic acid and a preparation method thereof. Background technique [0002] Polyamide has excellent mechanical properties and molding properties, and is widely used in the processing of auto parts and parts of electrical and electronic equipment. However, due to the regular arrangement of molecular chains and poor transparency of ordinary polyamide, it is difficult to play a role in special fields. [0003] In actual use, traditional transparent plastics cannot fully meet the requirements of specific use scenarios. For example, the main transparent plastics PC (polycarbonate) and PMMA (polymethyl methacrylate) on the market have small molecule residues and chemical corrosion resistance. Poor performance, poor wear resistance and other problems. [0004] In the prior art, the synthesis of tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26C08G69/28C08K5/098C08K3/32
CPCC08G69/265C08G69/28C08K3/32C08K5/098
Inventor 邵威郑毅秦兵兵刘修才
Owner CATHAY R&D CENT CO LTD
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